Positive and negative pressure centralized control type vacuum generator

Abstract

The positive and negative pressure centralized control type vacuum generator comprises a valve assembly module and a main body module, the valve assembly module comprises a pneumatic control valve A and a pneumatic control valve B, and the pneumatic control valve A and the pneumatic control valve B are two-position three-way valves. The valve assembly module comprises a valve body, a valve cavity is formed in the valve body, a valve rod A and a valve rod B are arranged in the valve cavity, and an air port A, an air port B, an air port C, an air port D and an air port E which communicate with the valve cavity are formed in the valve body. And a vacuum generating device is arranged in the main body module. The vacuum generator is integrated with two two-position three-way valves, so that the vacuum generator integrates the functions of negative pressure generation and positive pressure driving. On the same equipment, negative pressure can be generated through positive-pressure gas, a workpiece is sucked through the suction cup, and the operation of breaking air and releasing the workpiece is carried out after carrying is completed; and positive pressure gas can be used for driving a single-acting cylinder or a single-acting gas claw and the like to execute tasks such as pushing and clamping, so that the application scene of the equipment is greatly expanded, the number of the equipment is reduced, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum generators, and particularly relates to a positive and negative pressure centralized control type vacuum generator. Background Art

[0002] In the field of industrial automation production, vacuum technology and pneumatic technology play a crucial role. A vacuum generator is a highly efficient, clean, and small vacuum component that uses a positive pressure air source to generate negative pressure, making it very easy and convenient to obtain negative pressure where there is compressed air or where both positive and negative pressures are required in a pneumatic system. Vacuum generators are widely used in fields such as machinery, electronics, packaging, printing, plastics, and robots in industrial automation. The traditional use of vacuum generators is to cooperate with suction cups for the adsorption and handling of various materials, especially suitable for adsorbing fragile, soft, non-metallic materials, or spherical objects.

[0003] For example, a valve island type vacuum generator system disclosed in a Chinese invention patent (Publication No.: CN119267344A) includes a plurality of vacuum generators. The vacuum generator includes a main body module, a valve assembly module, and a pressure gauge module. The valve assembly module includes a vacuum valve, a vacuum breaking valve, a vacuum pilot valve, and a vacuum breaking pilot valve. Both the vacuum valve and the vacuum breaking valve are two-position two-way pneumatically controlled valves. When the vacuum valve works, positive pressure gas enters the nozzle assembly through the air path to generate negative pressure gas, and the negative pressure gas drives the negative pressure suction working port to suck air for adsorbing workpieces. When the vacuum breaking valve works, the vacuum breaking valve outlet of the vacuum breaking valve is communicated with the vacuum breaking valve inlet, and the positive pressure gas is divided into two paths after coming out of the vacuum breaking valve outlet. The first path of gas reaches the negative pressure suction working port to break the vacuum and release the workpiece; the second path of gas enters the nozzle assembly and is discharged from the centralized exhaust port.

[0004] However, in the valve island type vacuum generator system disclosed in the above prior art, both the vacuum valve and the vacuum breaking valve are two-position two-way pneumatically controlled valves. The functional limitations of the two-position two-way pneumatically controlled valve only enable simple air path on-off control, and can only meet the operation requirements of the vacuum generator for generating negative pressure and breaking the vacuum. It is impossible to achieve precise control and distribution of positive pressure gas, resulting in unstable flow rate of the positive pressure gas flowing to the working port, and thus unable to achieve the positive pressure driving function, such as driving the operation of single-acting cylinders, single-acting grippers, etc. Therefore, it is difficult to meet the requirements of multi-functional integration of equipment in industrial production, restricting the further improvement of production efficiency and the expansion of equipment application scenarios.

[0005] Therefore, it is necessary to improve the prior art. Summary of the Invention

[0006] The object of the present invention is to provide a positive and negative pressure centralized control type vacuum generator for the defects and deficiencies of the prior art. It integrates two two-way three-way valves, enabling the vacuum generator to combine the functions of negative pressure generation and positive pressure drive. On the same device, it can not only generate negative pressure using positive pressure gas, suck workpieces through a suction cup, and release the workpieces after evacuation when the handling is completed; but also drive a single-acting cylinder or a single-acting gripper using positive pressure gas when needed to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the device, reduces the number of devices, and saves production costs.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A positive and negative pressure centralized control type vacuum generator, comprising a valve assembly module and a main body module. The valve assembly module includes a pneumatic control valve A and a pneumatic control valve B, and both the pneumatic control valve A and the pneumatic control valve B are two-way three-way valves; the valve assembly module includes a valve body, a valve cavity is arranged in the valve body, a valve rod A and a valve rod B are arranged in the valve cavity, and air ports A, B, C, D and E respectively communicated with the valve cavity are arranged on the valve body; the valve rod A has a first working position and a second working position. When the valve rod A is in the first working position, the air port A is communicated with the air port B. When the valve rod A is in the second working position, the air port B is communicated with the air port C; the valve rod B has a third working position and a fourth working position. When the valve rod B is in the third working position, the air port D is communicated with the air port E. When the valve rod B is in the fourth working position, the air port C is communicated with the air port D; a vacuum generating device is arranged in the main body module, the intake port of the vacuum generating device is communicated with the air port D through a first air passage, and the negative pressure outlet of the vacuum generating device is communicated with the air port A through a second air passage; the main body module is provided with an intake port and a working port, the intake port is communicated with the air port C through a third air passage, and the working port is communicated with the air port B through a fourth air passage.

[0008] Further, the valve assembly module further includes a pilot valve A and a pilot valve B. The valve rod A and the valve rod B divide the valve cavity into a first chamber, a second chamber and a third chamber. The first chamber is communicated with the pilot valve A, the second chamber is communicated with the third air passage through the air port C, and the third chamber is communicated with the pilot valve B.

[0009] Further, a suction cup is arranged at the working port.

[0010] Further, a single-acting cylinder or a single-acting gripper is arranged at the working port.

[0011] Further, the vacuum generating device includes a primary nozzle and a secondary nozzle connected in sequence. The main body module is provided with a primary suction side hole corresponding to the primary nozzle and a secondary suction side hole corresponding to the secondary nozzle, and a diaphragm is arranged at the secondary suction side hole.

[0012] Furthermore, a one-way throttle valve is provided between the working port and the air port B for regulating the flow rate of the positive-pressure gas flowing from the air port B to the working port.

[0013] Furthermore, the one-way throttle valve includes a one-way valve and a throttle valve, and the one-way valve and the throttle valve are arranged in parallel between the working port and the air port B.

[0014] Furthermore, a throttle valve cavity is provided in the main body module, a first valve port communicating with the working port is provided in the throttle valve cavity, an adjusting rod for adjusting the opening degree of the first valve port is provided in the throttle valve cavity, and the adjusting rod is threadedly connected to the main body module.

[0015] Furthermore, a one-way valve cavity communicating with the throttle valve cavity is provided in the main body module, a second valve port communicating with the working port is provided in the one-way valve cavity, a valve core and a spring corresponding to and cooperating with the second valve port are further provided in the one-way valve cavity, and the spring always makes the valve core have a tendency to close the second valve port.

[0016] Furthermore, the main body module includes a pressure gauge for detecting the air pressure value flowing out of the one-way throttle valve.

[0017] After adopting the above structure, the beneficial effect of the present invention is as follows: A positive and negative pressure centralized control type vacuum generator of the present invention includes a valve assembly module and a main body module. The valve assembly module includes a pneumatic control valve A and a pneumatic control valve B, and both the pneumatic control valve A and the pneumatic control valve B are two-way three-way valves. It integrates two two-way three-way valves, enabling the vacuum generator to combine the functions of negative pressure generation and positive pressure drive. On the same device, it can not only generate negative pressure using positive-pressure gas, suck workpieces through a suction cup, and perform the operation of breaking the vacuum to release the workpieces after the handling is completed; but also drive a single-acting cylinder or a single-acting gripper using positive-pressure gas when needed to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the device, reduces the number of devices, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is an exploded view of the overall structure of the present invention; Figure 3 is a cross-section of the overall structure of the present invention Figure 1 ; Figure 4 is the overall structural cross-section of the present invention Figure 2 ; Figure 5 is of the present invention Figure 4 schematic enlarged view of the structure at location A; Figure 6 is the overall structural cross-section of the present invention Figure 3 ; Figure 7 is the cross-sectional view of the valve assembly module of the present invention; Figure 8 is the pneumatic principle of the present invention Figure 1 (when the whole machine is in the shutdown state); Figure 9 is the pneumatic principle of the present invention Figure 2 (when the vacuum is generated); Figure 10 is the pneumatic principle of the present invention Figure 3 (breaking the vacuum when the vacuum is generated); Figure 11 is the pneumatic principle of the present invention Figure 4 (breaking the vacuum when the vacuum is stopped); Figure 12 is the pneumatic principle of the present invention Figure 5 (driving a single-acting cylinder); Figure 13 is the pneumatic principle of the present invention Figure 6 (resetting the single-acting cylinder); Figure 14 is the pneumatic principle of the present invention Figure 7 (driving a single-acting gripper); Figure 15 is the pneumatic principle of the present invention Figure 8 (resetting the single-acting gripper); Figure 16 is the schematic diagram of the cooperative connection when several vacuum generators of the present invention are used jointly.

[0020] Figures 1 to 16 The reference numerals in the figure are: 1. Valve body; 11. Air port A; 12. Air port B; 13. Air port C; 14. Air port D; 15. Air port E; 2. Valve cavity; 21. Valve stem A; 22. Valve stem B; 23. First chamber; 24. Second chamber; 25. Third chamber; 3. Vacuum generating device; 31. Intake port; 32. Negative pressure outlet; 33. Primary nozzle; 34. Secondary nozzle; 35. Outlet port; 351. Silencing device; 4. One-way throttle valve; 41. Check valve; 411. Check valve cavity; 412. Second valve port; 413. Spool; 414. Spring; 42. Throttle valve; 421. Throttle valve cavity; 422. First valve port; 423. Adjusting rod; 5. Suction cup; 6. Single-acting cylinder; 7. Single-acting gripper; 8. Pressure gauge; 9. Main intake pipe; 10. First air passage; 20. Second air passage; 30. Third air passage; 40. Fourth air passage; 100. Valve assembly module; 101. Pneumatic control valve A; 102. Pneumatic control valve B; 103. Pilot valve A; 104. Pilot valve B; 200. Main body module; 201. Intake port; 202. Working port; 203. Primary suction side hole; 204. Secondary suction side hole; 2041. Diaphragm. Detailed implementation mode

[0021] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation mode of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or working position relationship indicated by these terms is based on the orientation or working position relationship shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, if the term "a plurality of" appears, the meaning of the term "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly defined and limited, if terms such as "mounted", "connected", "connected to", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly defined and limited, if there are descriptions such as a first feature being "on" or "under" a second feature, etc., the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present invention are only for the purpose of illustration and do not represent the only implementation manner.

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0028] As Figures 1 to 16As shown, a positive and negative pressure centralized control type vacuum generator includes a valve component module 100 and a main body module 200. The valve component module 100 includes a pneumatic control valve A101 and a pneumatic control valve B102, and both the pneumatic control valve A101 and the pneumatic control valve B102 are two-position three-way valves. The valve component module 100 includes a valve body 1. A valve cavity 2 is provided inside the valve body 1. A valve rod A21 and a valve rod B22 are provided inside the valve cavity 2. The valve body 1 is provided with an air port A11, an air port B12, an air port C13, an air port D14 and an air port E15 that are respectively communicated with the valve cavity 2. The valve rod A21 has a first working position and a second working position. When the valve rod A21 is located at the first working position, the air port A11 is communicated with the air port B12. When the valve rod A21 is located at the second working position, the air port B12 is communicated with the air port C13. The valve rod B22 has a third working position and a fourth working position. When the valve rod B22 is located at the third working position, the air port D14 is communicated with the air port E15. When the valve rod B22 is located at the fourth working position, the air port C13 is communicated with the air port D14. A vacuum generating device 3 is provided inside the main body module 200. An intake port 31 of the vacuum generating device 3 is communicated with the air port D14 through a first air passage 10. A negative pressure outlet 32 of the vacuum generating device 3 is communicated with the air port A11 through a second air passage 20. The main body module 200 is provided with an intake port 201 and a working port 202. The intake port 201 is communicated with the air port C13 through a third air passage 30. The working port 202 is communicated with the air port B12 through a fourth air passage 40. A silencing device 351 is connected to an air outlet port 35 of the vacuum generating device 3. The valve component module 100 further includes a pilot valve A103 and a pilot valve B104. The valve rod A21 and the valve rod B22 divide the valve cavity 2 into a first chamber 23, a second chamber 24 and a third chamber 25. The first chamber 23 is communicated with the pilot valve A103. The second chamber 24 is communicated with the third air passage 30 through the air port C13. The third chamber 25 is communicated with the pilot valve B104.

[0029] Based on the above embodiments, the present invention aims to provide a positive and negative pressure centralized control type vacuum generator, which includes a valve assembly module 100 and a main body module 200. The valve assembly module 100 includes a pneumatic control valve A101 and a pneumatic control valve B102, and both the pneumatic control valve A101 and the pneumatic control valve B102 are two-position three-way valves. The valve assembly module 100 includes a valve body 1, a valve chamber 2 is arranged inside the valve body 1, a valve rod A21 and a valve rod B22 are arranged inside the valve chamber 2, and air ports A11, air ports B12, air ports C13, air ports D14 and air ports E15 which are respectively communicated with the valve chamber 2 are arranged on the valve body 1. The valve rod A21 has a first working position and a second working position. When the valve rod A21 is in the first working position, the air port A11 is communicated with the air port B12. When the valve rod A21 is in the second working position, the air port B12 is communicated with the air port C13. The valve rod B22 has a third working position and a fourth working position. When the valve rod B22 is in the third working position, the air port D14 is communicated with the air port E15. When the valve rod B22 is in the fourth working position, the air port C13 is communicated with the air port D14. A vacuum generating device 3 is arranged inside the main body module 200. The air inlet port 31 of the vacuum generating device 3 is communicated with the air port D14 through a first air passage 10, and the negative pressure outlet 32 of the vacuum generating device 3 is communicated with the air port A11 through a second air passage 20. The main body module 200 is provided with an air inlet 201 and a working port 202. The air inlet 201 is communicated with the air port C13 through a third air passage 30, and the working port 202 is communicated with the air port B12 through a fourth air passage 40. It integrates two two-position three-way valves, enabling the vacuum generator to combine the functions of negative pressure generation and positive pressure drive. On the same device, it can not only generate negative pressure using positive pressure gas, suck workpieces through a suction cup 5, and perform the operation of breaking the vacuum to release the workpieces after the handling is completed, but also drive a single-acting cylinder 6 or a single-acting gripper 7 using positive pressure gas when needed to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the device, reduces the number of devices, and saves production costs.

[0030] In a further preferred embodiment, several vacuum generators can also be used in combination. For example, Figure 16 as shown, the multiple vacuum generators are uniformly supplied with air through a main inlet pipe 9. The several vacuum generators used in combination can be controlled separately. For example, some vacuum generators control the suction cup 5, some vacuum generators control the single-acting cylinder 6, and some vacuum generators control the single-acting gripper 7. Moreover, each vacuum generator is separately controlled to start and stop, realizing flexible control and improving the practicality of the product.

[0031] As another preferred solution of the present invention, a suction cup 5 is arranged at the working port 202. In this embodiment, as Figure 8As shown, when both the pilot valve A103 and the pilot valve B104 are de-energized, the valve stem A21 is in the first position, the air port A11 is in communication with the air port B12, the air port A11 is disconnected from the air port C13, and gas is not introduced into the pneumatic control valve A101; the valve stem B22 is in the third position, the air port D14 is in communication with the air port E15, the air port D14 is disconnected from the air port C13, and gas is not introduced into the pneumatic control valve B102, and the vacuum generator is in a shutdown state.

[0032] In this embodiment, as Figure 9 shown, when the pilot valve B104 is energized and the pilot valve A103 is de-energized, the positive-pressure gas flows through the pilot valve B104 to the third chamber 25. Since the cross-sectional area of the end of the valve stem B22 located in the third chamber 25 is larger than the cross-sectional area of the end of the valve stem B22 located in the second chamber 24, the valve stem B22 moves from the third position to the fourth position, the air port D14 is in communication with the air port C13, the valve stem A21 is in the first position, and the air ports A11 and B12 are in communication; the positive-pressure gas enters the intake port 31 of the vacuum generating device 3 via the intake port 201, the third air passageway 30, the air port C13, the air port D14, and the first air passageway 10. The positive-pressure gas flows through the primary nozzle 33 and the secondary nozzle 34 to generate a negative pressure. The negative-pressure gas enters the one-way throttle valve 4 via the negative-pressure outlet 32, the second air passageway 20, the air port A11, the air port B12, and the fourth air passageway 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202, and the workpiece is grasped by the suction cup 5 provided at the working port 202.

[0033] In this embodiment, as Figure 10As shown, when both the pilot valve B104 and the pilot valve A103 are in the energized state, the positive-pressure gas flows through the pilot valve B104 to the third chamber 25. Since the cross-sectional area of the end of the valve stem B22 located in the third chamber 25 is larger than the cross-sectional area of the end of the valve stem B22 located in the second chamber 24, the valve stem B22 moves from the third position to the fourth position, and the air port D14 communicates with the air port C13; the positive-pressure gas flows through the pilot valve A103 to the first chamber 23. Since the cross-sectional area of the end of the valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of the end of the valve stem A21 located in the second chamber 24, the valve stem A21 moves from the first position to the second position, and the air port B12 communicates with the air port C13; the positive-pressure gas enters the intake port 31 of the vacuum generating device 3 via the intake port 201, the third air passage 30, the air port C13, the air port D14 and the first air passage 10. The positive-pressure gas flows through the primary nozzle 33 and the secondary nozzle 34 to generate a negative pressure. The negative-pressure gas flows through the negative-pressure outlet 32 and the second air passage 20 to the air port A11. At this time, the air port A11 is disconnected from the air port B12, and the negative-pressure gas cannot flow continuously; the positive-pressure gas enters the one-way throttle valve 4 via the intake port 201, the third air passage 30, the air port C13, the air port B12 and the fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202 and breaks the vacuum of the suction cup 5 at the working port 202, so that the suction cup 5 releases the workpiece. In this embodiment, the valve stem B22 is always located at the fourth position, so that the first air passage 10 is always filled with positive-pressure gas, and the second air passage 20 is always filled with negative-pressure gas. When the pneumatic control valve A101 moves from the second position to the first position, the negative-pressure gas can quickly enter the fourth air passage 40 via the air port A11 and the air port B12, and then flows to the suction cup 5 after the flow rate is adjusted by the one-way throttle valve 4 for the next operation of grasping the workpiece, realizing the quick switching between grasping the workpiece and releasing the workpiece, and is applicable to working conditions that require quick switching of the working state.

[0034] In other preferred embodiments, such as Figure 11As shown, when the pilot valve B104 is in the power-off state and the pilot valve A103 is in the power-on state, the valve stem B22 is in the third position, the air port D14 is communicated with the air port E15, the air port D14 is disconnected from the air port C13, and the gas is not introduced into the pneumatic control valve B102; the positive-pressure gas flows through the pilot valve A103 to the first chamber 23. Since the cross-sectional area of the end of the valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of the end of the valve stem A21 located in the second chamber 24, the valve stem A21 moves from the first position to the second position, the air port B12 and the air port C13 are communicated, and the positive-pressure gas enters the one-way throttle valve 4 through the air inlet 201, the third air passage 30, the air port C13, the air port B12 and the fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202 and evacuates the suction cup 5 at the working port 202, so that the suction cup 5 releases the workpiece. It is applicable to the working conditions where the workpiece is released and then the workpiece is sucked after a period of time, that is, it is applicable to the working conditions where the working state does not need to be quickly switched.

[0035] In a further preferred embodiment, a compression spring (not shown in the figure) may be further disposed in the second chamber 24. One end of the compression spring abuts against the valve stem A21, and the other end of the compression spring abuts against the valve stem B22. The function of the compression spring is that when the vacuum generator loses power or air supply, the valve stem A21 and the valve stem B22 are reset under the elastic force of the compression spring. Among them, the valve stem A21 moves to the first working position, and the valve stem B22 moves to the third working position, increasing the application scenarios of the vacuum generator. For example, when driving the single-acting cylinder 6 to extend, when the vacuum generator loses air supply, the return spring 414 resets the valve stem B22. At this time, the piston rod of the cylinder can be moved manually.

[0036] As another preferred solution of the present invention, the working port 202 is provided with a single-acting cylinder 6 or a single-acting gripper 7. In this embodiment, as Figure 12 and Figure 14As shown, when the pilot valve B104 is in the power-off state and the pilot valve A103 is in the powered-on state, the valve stem B22 is in the third position, the air port D14 is in communication with the air port E15, the air port D14 is disconnected from the air port C13, and gas is not introduced into the pneumatic control valve B102; the positive-pressure gas flows through the pilot valve A103 to the first chamber 23. Since the cross-sectional area of the end of the valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of the end of the valve stem A21 located in the second chamber 24, the valve stem A21 moves from the first position to the second position, the air port B12 and the air port C13 are in communication, and the positive-pressure gas enters the one-way throttle valve 4 via the air inlet 201, the third air passage 30, the air port C13, the air port B12, and the fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202 and drives the piston rod of the single-acting cylinder 6 to extend or drives the single-acting gripper 7 to clamp. In this embodiment, the positive-pressure gas flowing out of the air port B12 all enters the one-way throttle valve 4 through the fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202, realizing the adjustment of the operating speed of the single-acting cylinder 6, thereby realizing the precise control and distribution of the positive-pressure gas, and further realizing the function of driving the single-acting cylinder 6 or the single-acting gripper 7 with the positive-pressure gas. In this embodiment, when driving the single-acting cylinder 6 to extend, in the case of the vacuum generator running out of gas, the piston rod of the single-acting cylinder 6 still maintains its original position. For example, for a single-acting cylinder 6 installed vertically, the workpiece lifted by its piston rod will not suddenly fall due to the vacuum generator running out of gas, improving the use safety.

[0037] In this embodiment, as Figure 13 and Figure 15 shown, when both the pilot valve B104 and the pilot valve A103 are in the power-off state, the valve stem B22 is in the third position, the air port D14 is in communication with the air port E15, the air port D14 is disconnected from the air port C13, and gas is not introduced into the pneumatic control valve B102; the valve stem A21 is in the first position, the air port A11 is in communication with the air port B12, and the piston rod of the single-acting cylinder 6 or the gripper of the single-acting gripper 7 is reset under the elastic force of the compression spring. The positive-pressure gas in the single-acting cylinder 6 or the single-acting gripper 7 is discharged from the silencing device 351 after passing through the fourth air passage 40, the air port B12, the air port A11, the second air passage 20, the negative-pressure outlet 32, and the air outlet port 35, realizing the retraction of the piston rod of the single-acting cylinder 6 or the release of the gripper of the single-acting gripper 7.

[0038] As another preferred solution of the present invention, the vacuum generating device 3 includes a primary nozzle 33 and a secondary nozzle 34 connected in sequence. On the main body module 200, there are provided a primary suction side hole 203 corresponding to the primary nozzle 33 and a secondary suction side hole 204 corresponding to the secondary nozzle 34. A diaphragm 2041 is provided at the secondary suction side hole 204. In this embodiment, as Figure 4 and Figure 5 shown, through this two-stage vacuum structural design, especially by the organic combination of the primary nozzle 33 and the secondary nozzle 34, the negative pressure generated at the primary nozzle 33 is greater than that at the secondary nozzle 34. Therefore, the negative pressure is generated with the primary nozzle 33 as the core. However, the flow rate generated by the primary nozzle 33 is relatively small and cannot quickly generate an adsorption effect. Therefore, the secondary nozzle 34 is used together to increase the negative pressure flow rate, improve the vacuum suction speed, and reduce the consumption of positive pressure gas. When the vacuum degree in the second air passage 20 is greater than the vacuum degree of the secondary suction side hole 204, the diaphragm 2041 closes to avoid weakening the vacuum degree in the second air passage 20.

[0039] In a further preferred embodiment, diaphragms 2041 are provided at both the primary suction side hole 203 and the secondary suction side hole 204. When the suction cup 5 adsorbs the workpiece and the pressure gauge detects that the vacuum degree reaches the set value, the intake air source is cut off. At this time, the diaphragms 2041 block both the primary suction side hole 203 and the secondary suction side hole 204 to achieve the pressure holding function; when the pressure gauge detects that the vacuum degree is lower than the set vacuum value, the intake air source is opened, thereby achieving the air saving function.

[0040] As another preferred solution of the present invention, a one-way throttle valve 4 is provided between the working port 202 and the air port B12 for regulating the flow rate of the positive pressure gas flowing from the air port B12 to the working port 202. The one-way throttle valve 4 includes a one-way valve 41 and a throttle valve 42, and the one-way valve 41 and the throttle valve 42 are arranged in parallel between the working port 202 and the air port B12. A throttle valve cavity 421 is provided in the main body module 200. A first valve port 422 communicating with the working port 202 is provided in the throttle valve cavity 421. An adjusting rod 423 for adjusting the opening degree of the first valve port 422 is provided in the throttle valve cavity 421, and the adjusting rod 423 is threadedly connected to the main body module 200. A one-way valve cavity 411 communicating with the throttle valve cavity 421 is provided in the main body module 200. A second valve port 412 communicating with the working port 202 is provided in the one-way valve cavity 411. A valve core 413 and a spring 414 corresponding to and cooperating with the second valve port 412 are further provided in the one-way valve cavity 411, and the spring 414 makes the valve core 413 always have a tendency to close the second valve port 412. In this embodiment, as Figure 5 and Figure 6As shown, the flow rate of the positive-pressure gas is regulated by the one-way throttle valve 4 to regulate the breaking pressure, or to regulate the thrust of the piston rod of the single-acting cylinder 6, or to regulate the clamping force of the single-acting gripper 7. Specifically, when the positive-pressure gas flows through the throttle valve chamber 421, by rotating the adjusting rod 423, the adjusting rod 423 moves towards the first valve port 422 or away from the first valve port 422, thereby regulating the opening degree of the first valve port 422. At the same time, the positive-pressure gas enters the one-way valve chamber 411, and the positive-pressure gas and the spring 414 jointly apply a force to the valve core 413 to close the second valve port 412, so that the positive-pressure gas can only flow through the throttle valve 42, realizing the throttling function of the positive-pressure gas. At the same time, the one-way throttle valve 4 does not throttle the negative-pressure gas and does not affect the adsorption efficiency. Specifically, when the negative-pressure gas flows through the one-way valve chamber 411, the valve core 413 overcomes the elastic force of the spring 414 under the suction force of the negative-pressure gas and opens the second valve port 412, so that the negative-pressure gas is not affected by the throttle valve 42. In a further preferred embodiment, the main body module 200 is provided with a bolt (not shown in the figure) for restricting the adjusting rod 423 from coming out. The bolt is provided with an umbrella-shaped cap, and the umbrella-shaped cap is in abutting cooperation with the outermost end of the adjusting rod 423. Through this structural design, it is avoided that when the adjusting rod 423 is adjusted to the outermost side, it detaches from the main body module 200 under the action of air pressure. In a further preferred embodiment, an elastic member is provided in the throttle valve chamber 421, and the elastic member is in abutting cooperation with the adjusting rod 423 to prevent the adjusting rod 423 from loosening under the alternating action of positive-pressure and negative-pressure gases.

[0041] As another preferred solution of the present invention, the main body module 200 includes a pressure gauge 8 for detecting the air pressure value flowing out of the one-way throttle valve 4. In this embodiment, as Figure 6 and Figure 8 shown, the pressure gauge 8 is provided to detect the air pressure value flowing from the fourth air passage 40 to the working port 202, so as to realize real-time monitoring of the suction force of the suction cup 5, the thrust of the single-acting cylinder 6, or the clamping force of the single-acting gripper 7.

[0042] Obviously, the above embodiments are only examples given clearly and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A positive and negative pressure centralized control type vacuum generator, comprising a valve assembly module (100) and a main body module (200), characterized in that: The valve assembly module (100) includes a pneumatically controlled valve A (101) and a pneumatically controlled valve B (102), and both the pneumatically controlled valve A (101) and the pneumatically controlled valve B (102) are two-position three-way valves; the valve assembly module (100) includes a valve body (1), a valve cavity (2) is arranged inside the valve body (1), a valve stem A (21) and a valve stem B (22) are arranged inside the valve cavity (2), and an air port A (11), an air port B (12), an air port C (13), an air port D (14) and an air port E (15) that are respectively communicated with the valve cavity (2) are arranged on the valve body (1); the valve stem A (21) has a first working position and a second working position. When the valve stem A (21) is in the first working position, the air port A (11) is communicated with the air port B (12). When the valve stem A (21) is in the second working position, the air port B (12) is communicated with the air port C (13); the valve stem B (22) has a third working position and a fourth working position. When the valve stem B (22) is in the third working position, the air port D (14) is communicated with the air port E (15). When the valve stem B (22) is in the fourth working position, the air port C (13) is communicated with the air port D (14); a vacuum generating device (3) is arranged inside the main body module (200), an air inlet port (31) of the vacuum generating device (3) is communicated with the air port D (14) through a first air passage (10), and a negative pressure outlet (32) of the vacuum generating device (3) is communicated with the air port A (11) through a second air passage (20); the main body module (200) is provided with an air inlet (201) and a working port (202), the air inlet (201) is communicated with the air port C (13) through a third air passage (30), and the working port (202) is communicated with the air port B (12) through a fourth air passage (40).

2. The positive and negative pressure centralized control type vacuum generator according to claim 1, wherein: The valve assembly module (100) further includes a pilot valve A (103) and a pilot valve B (104). The valve stem A (21) and the valve stem B (22) divide the valve cavity (2) into a first chamber (23), a second chamber (24) and a third chamber (25). The first chamber (23) is communicated with the pilot valve A (103), the second chamber (24) is communicated with the third air passage (30) through the air port C (13), and the third chamber (25) is communicated with the pilot valve B (104).

3. The positive and negative pressure centralized control type vacuum generator according to claim 1, characterized in that: A suction cup (5) is arranged at the working port (202).

4. A positive and negative pressure centralized control type vacuum generator according to claim 1, characterized in that: A single-acting cylinder (6) or a single-acting gripper (7) is arranged at the working port (202).

5. A positive and negative pressure centralized control type vacuum generator according to claim 1, characterized in that: The vacuum generating device (3) includes a primary nozzle (33) and a secondary nozzle (34) connected in sequence. A primary suction side hole (203) corresponding to the primary nozzle (33) and a secondary suction side hole (204) corresponding to the secondary nozzle (34) are arranged on the main body module (200), and a diaphragm (2041) is arranged at the secondary suction side hole (204).

6. The positive and negative pressure centralized control type vacuum generator according to claim 1, characterized in that: A one-way throttle valve (4) is arranged between the working port (202) and the air port B (12) to regulate the flow rate of the positive-pressure gas flowing from the air port B (12) to the working port (202).

7. The positive and negative pressure centralized control type vacuum generator according to claim 6, characterized in that: The one-way throttle valve (4) includes a one-way valve (41) and a throttle valve (42), and the one-way valve (41) and the throttle valve (42) are arranged in parallel between the working port (202) and the air port B (12).

8. The positive and negative pressure centralized control type vacuum generator according to claim 7, characterized in that: A throttle valve cavity (421) is provided in the main body module (200). A first valve port (422) communicating with the working port (202) is provided in the throttle valve cavity (421). An adjusting rod (423) for adjusting the opening degree of the first valve port (422) is provided in the throttle valve cavity (421), and the adjusting rod (423) is threadedly connected to the main body module (200).

9. The positive and negative pressure centralized control type vacuum generator according to claim 8, wherein: A one-way valve cavity (411) communicating with the throttle valve cavity (421) is provided in the main body module (200). A second valve port (412) communicating with the working port (202) is provided in the one-way valve cavity (411). A valve core (413) and a spring (414) corresponding to and cooperating with the second valve port (412) are further provided in the one-way valve cavity (411), and the spring (414) makes the valve core (413) always have a movement tendency to close the second valve port (412).

10. A positive and negative pressure centralized control type vacuum generator according to claim 6, characterized in that: The main body module (200) includes a pressure gauge (8) for detecting the air pressure value flowing out of the one-way throttle valve (4).

Images